feat: centralize DeepSeek SSE parsing, improve account identifier resolution, and simplify CORS configuration.

internal/sse/consumer.go

@@ -31,22 +31,15 @@ func CollectStream(resp *http.Response, thinkingEnabled bool, closeBody bool) Co
 		currentType = "thinking"
 	}
 	_ = deepseek.ScanSSELines(resp, func(line []byte) bool {
-		chunk, done, ok := ParseDeepSeekSSELine(line)
-		if !ok {
+		result := ParseDeepSeekContentLine(line, thinkingEnabled, currentType)
+		currentType = result.NextType
+		if !result.Parsed {
 			return true
 		}
-		if done {
+		if result.Stop {
 			return false
 		}
-		if _, hasErr := chunk["error"]; hasErr {
-			return false
-		}
-		parts, finished, newType := ParseSSEChunkForContent(chunk, thinkingEnabled, currentType)
-		currentType = newType
-		if finished {
-			return false
-		}
-		for _, p := range parts {
+		for _, p := range result.Parts {
 			if p.Type == "thinking" {
 				thinking.WriteString(p.Text)
 			} else {

internal/sse/line.go

@@ -0,0 +1,49 @@
+package sse
+
+import "fmt"
+
+// LineResult is the normalized parse result for one DeepSeek SSE line.
+type LineResult struct {
+	Parsed        bool
+	Stop          bool
+	ContentFilter bool
+	ErrorMessage  string
+	Parts         []ContentPart
+	NextType      string
+}
+
+// ParseDeepSeekContentLine centralizes one-line DeepSeek SSE parsing for both
+// streaming and non-streaming handlers.
+func ParseDeepSeekContentLine(raw []byte, thinkingEnabled bool, currentType string) LineResult {
+	chunk, done, parsed := ParseDeepSeekSSELine(raw)
+	if !parsed {
+		return LineResult{NextType: currentType}
+	}
+	if done {
+		return LineResult{Parsed: true, Stop: true, NextType: currentType}
+	}
+	if errObj, hasErr := chunk["error"]; hasErr {
+		return LineResult{
+			Parsed:       true,
+			Stop:         true,
+			ErrorMessage: fmt.Sprintf("%v", errObj),
+			NextType:     currentType,
+		}
+	}
+	if code, _ := chunk["code"].(string); code == "content_filter" {
+		return LineResult{
+			Parsed:        true,
+			Stop:          true,
+			ContentFilter: true,
+			ErrorMessage:  "content filtered by upstream",
+			NextType:      currentType,
+		}
+	}
+	parts, finished, nextType := ParseSSEChunkForContent(chunk, thinkingEnabled, currentType)
+	return LineResult{
+		Parsed:   true,
+		Stop:     finished,
+		Parts:    parts,
+		NextType: nextType,
+	}
+}

internal/sse/line_test.go

@@ -0,0 +1,37 @@
+package sse
+
+import "testing"
+
+func TestParseDeepSeekContentLineDone(t *testing.T) {
+	res := ParseDeepSeekContentLine([]byte("data: [DONE]"), false, "text")
+	if !res.Parsed || !res.Stop {
+		t.Fatalf("expected parsed stop result: %#v", res)
+	}
+}
+
+func TestParseDeepSeekContentLineError(t *testing.T) {
+	res := ParseDeepSeekContentLine([]byte(`data: {"error":"boom"}`), false, "text")
+	if !res.Parsed || !res.Stop {
+		t.Fatalf("expected stop on error: %#v", res)
+	}
+	if res.ErrorMessage == "" {
+		t.Fatalf("expected non-empty error message")
+	}
+}
+
+func TestParseDeepSeekContentLineContentFilter(t *testing.T) {
+	res := ParseDeepSeekContentLine([]byte(`data: {"code":"content_filter"}`), false, "text")
+	if !res.Parsed || !res.Stop || !res.ContentFilter {
+		t.Fatalf("expected content-filter stop result: %#v", res)
+	}
+}
+
+func TestParseDeepSeekContentLineContent(t *testing.T) {
+	res := ParseDeepSeekContentLine([]byte(`data: {"p":"response/content","v":"hi"}`), false, "text")
+	if !res.Parsed || res.Stop {
+		t.Fatalf("expected parsed non-stop result: %#v", res)
+	}
+	if len(res.Parts) != 1 || res.Parts[0].Text != "hi" || res.Parts[0].Type != "text" {
+		t.Fatalf("unexpected parts: %#v", res.Parts)
+	}
+}